Low Voltage Power Monitoring
Need advice on selecting a device to measure and log incoming power.
Why does RS-232 continue to be the data comm standard for PLC's?
By Bob Peterson on 8 October, 2015 - 10:28 am
While Curt is not entirely wrong in his assessment, RS232 has some issues for use in industrial...
By Curt Wuollet on 7 October, 2015 - 10:15 pm
Call it installed base or least common denominator, but RS232 is still prevalent for some very...
By llinse on 7 October, 2015 - 3:41 pm
As mentioned this is changing, but I think you are not thinking the problem through fully - there...
By Bob Peterson on 6 October, 2015 - 3:15 pm
RS485 is almost as old as RS232. They have both been around a long time. The problem is both are...
By Steve Myres on 6 October, 2015 - 12:23 pm
USB to some extent, and especially Ethernet, are becoming common on current generation PLC's. ...
ABB Procontic T200 programming software
ABB Procontic T200 PLC programming software.
Can We Change Function Code
Can we change function code for example 01 is for output coil status instead of 01 we can't assign 02 for output coil status maybe it's a ridiculous question but I have a little bit on that source code is only fixed or variable
How to design a simple Data Acquisition System
By Steve Myres on 7 October, 2015 - 4:33 pm
It has support for quite a few industrial protocols, including Modbus RTU and TCP, so there are a...
Thermo Electric Controler
Posted by alan sheahan on 7 October, 2015 - 4:59 am
PLC in Class 1 Div 2, cooling options
are cooling options available for panels in Class 1 Div 2 areas?
By Thinker on 6 October, 2015 - 1:30 pm
I am going through same scenario.Class1 div 2 enclosure with PLC and cooler. I am using TECA 1800XP...
Captive Power Generation - Frequency Control
Load sharing and frequency control with multiple generators operating in parallel
OPC Connectivity of Package Vendors with ICSS
Connecting 3rd party package (Integrated Control and Safety System) to DCS
By datacontrol on 5 October, 2015 - 6:29 pm
I'll try address your first question. You will need an OPC Server per PLC- DCS vendor, if each...
PLC Watchdog - ControlLogix
For an industrial gas turbine application, should you require an independent watchdog for a ControlLogix PLC?
Separate Instrument Earth Pit
Separate Instrument Earth pit not available
RS485 MODBUS Slow Response
Slow response with two RS485 connections. Two Siemens PLC to one Yokogawa DCS ALR121 card.
By ICP DAS on 29 September, 2015 - 5:27 pm
2 master connections are not allowed on a single RS-485 bus. You will get data collisions and what...
Multiple Project Connection Package- Yokogawa CENTUMVP
Connecting two projects of Yokogawa CENTUM VP via multiple project connection package.
Measuring Output Current on an AC Motor Drive?
I need to log current and voltage output on one leg of an AC motor.
Controller Behaviour on Loss of PV
I cannot get to configure my controller to experience bumpless transfer on loss of PV signal and then re-instatement of the PV signal.
By Bob Peterson on 1 October, 2015 - 11:33 am
is this a PLC of some sort? if so, you can readily program this behavior. if it is a DCS, it may...
Does anybody know about manufacturers of safety plcs? ...
Connecting 2, 3, and 4 Wire Current Loops
Connecting 2, 3, and 4 wire current loops to the same current sinking PLC input card whilst avoiding ground loops.
How Does The Output Of The Pid Controller Remain Non-Zero?
How does the output of the PID controller remain non-zero after the error becomes zero?
Beginner needs assistance with step7 programming
By Steve Myres on 29 September, 2015 - 12:58 pm
Well, there's the ever-popular traffic light exercise. You can also try an elevator. First do a...
By c^2 on 28 September, 2015 - 7:56 pm
How about translating old equipment analog controls schematics to a controller that you have access...
How to Create MODBUS Master Using UART in Controller for HMI
Using a microcontroller as a MODBUS master as UART and controlling another device
GE Mark-II control upgrading
GE Mark-II control system upgrading with latest and reliable control system.
Configurable D-sub Adapter
Looking for ideas on a field-reconfigurable DB-9 cable or adapter?
By Curt Wuollet on 24 September, 2015 - 10:10 pm
First you get a soldering iron and a bunch of DB-9s, then you get a spool of high quality cable....
By Steve Myres on 24 September, 2015 - 1:11 pm
This is the one I like for that situation: http://www.winford.com/products/brksd9.php A mini...
LIB-MODBUS FOR ARM CORTEX-M3 Microcontroller
Want to port lib-Modbus for Linux for a microprocessor to the lib Modbus for cortex M3 microcontroller.
GE Mark VI: Alarms and TRE files
Is updating Mark VI configuration by modifying TRE files directly common?